Perspectives on Nodal Superconductors

Kazumi Maki; Stephan Haas; David Parker; Hyekyung Won

paper

Perspectives on Nodal Superconductors

arXiv:cond-mat/0407269

Abstract

In the last few years the gap symmetries of many new superconductors,including Sr $_{2}$ RuO $_{4}$ , CeCoIn $_{5}$ , $I^º$ -(ET) $_{2}$ Cu(NCS) $_{2}$ , YNi $_{2}$ B $_{2}$ C and PrOs $_{4}$ Sb $_{12}$ , have been identified via angle-dependent magnetothermal conductivity measurements. However, a controversy still persists as to the nature of the superconductivity in Sr $_{2}$ RuO $_{4}$ . For PrOs $_{4}$ Sb $_{12}$ , spin-triplet superconductivity has recently been proposed. Here, we also propose g-wave superconductivity for UPd $_{2}$ Al $_{3}$ (i.e., $I^ (k) = I^ cos (2 I ¨ ), I ¨ = c k_{z}$ ) based on recent thermal conductivity data.

12 pages, 7 improved figures